| Biography subtitle, perhaps | 27 |
| Biography's beginning? | 26 |
| Biol. and chem., for two | 24 |
| Biol. majors' awards | 24 |
| Biological building blocks | 26 |
| Biological classification | 25 |
| Biological classifications | 26 |
| Biological dividing wall | 24 |
| Biological duct travelers | 25 |
| Biological engineering | 22 |
| Biological food processor | 25 |
| Biological immunity agent | 25 |
| Biological inheritance | 22 |
| Biological interstices | 22 |
| Biological manipulation | 23 |
| Biological plant group: Var. | 28 |
| Biological ring of color | 24 |
| Biological rings of color | 25 |
| Biological subdivision | 22 |
| Biological subdivisions | 23 |
| Biological trait carrier | 24 |
| Biological transmitter | 22 |
| Biologist Stephen Jay ___ | 25 |
| Biologist's medium | 22 |
| Biology 101 subject (Var.) | 26 |
| Biology and chemistry: Abbr. | 28 |
| Biology class captives | 22 |
| Biology class dissection | 24 |
| Biology class initials | 22 |
| Biology class sighting | 22 |
| Biology lab slide specimen | 26 |
| Biology or chemistry: Abbr. | 27 |
| Biology or geology, e.g. | 24 |
| Bioluminescent beetles | 22 |
| Bioluminescent critters | 23 |
| Biomed. research agency | 23 |
| Biomedical research agcy. | 25 |
| Biomedical research inits. | 26 |
| Biomedical research org. | 24 |
| Bionic woman, for example | 25 |
| Biopic about Ritchie Valens | 27 |
| Biopic role for Will Smith | 26 |
| Biopic starring Will Smith | 26 |
| Biorhythm-regulating hormone | 28 |
| Biotin, thiamine et al. | 23 |
| Biotite and lepidolite | 22 |
| Biotite and phlogopite | 22 |
| Bipartite god of Egypt | 22 |
| Biped's claim to fame | 25 |
| Bipedal wolf's stare | 24 |
| Bipeds on some ranches | 22 |
| Bipolar disorder, for short | 27 |
| Biracial Latin American | 23 |
| Birch of "Alaska" | 27 |
| Birch ___, former senator | 25 |
| Birch''s cousin | 23 |
| Birch-beer brand of yore | 24 |
| Birchbark boat, perhaps | 23 |
| Bird also called a flycatcher | 29 |
| Bird also known as an apteryx | 29 |
| Bird becomes neatly joined | 26 |
| Bird causes this to swish | 25 |
| Bird eaten around Easter | 24 |
| Bird extinct since c. 1914 | 26 |
| Bird famed for its plumage | 26 |
| Bird flying in Boston Garden | 28 |
| Bird good at shooting? | 22 |
| Bird hunter's shelter | 25 |
| Bird hunters' practice | 26 |
| Bird in a "tuxedo" | 28 |
| Bird in a crazy simile | 22 |
| Bird in a Gallico title | 23 |
| Bird in a Grisham title | 23 |
| Bird in a John Grisham title | 28 |
| Bird in New South Wales | 23 |
| Bird in the bush, really | 24 |
| Bird in the crow family | 23 |
| Bird in the finch family | 24 |
| Bird indigenous to crosswords | 29 |
| Bird known for making baskets | 29 |
| Bird known for thievery | 23 |
| Bird more than five feet tall | 29 |
| Bird named for its call | 23 |
| Bird native to lava plains | 26 |
| Bird of brilliant plumage | 25 |
| Bird of immortality: Var. | 25 |
| Bird of paradise feature | 24 |
| Bird of prey without a mate? | 28 |
| Bird of prey's claw | 23 |
| Bird of prey's dip | 22 |
| Bird of prey's feint? | 25 |
| Bird of prey's grabber | 26 |
| Bird of prey's weapon | 25 |
| Bird of Sherwood Forest? | 24 |
| Bird of the 50th state | 22 |
| Bird of the crow family | 23 |
| Bird of the genus Corvus | 24 |
| Bird of the Golden State | 24 |
| Bird of the Paridae family | 26 |
| Bird of the rail family | 23 |